Calibre 2236 Is equipped using a Syloxi hairspring that is produced by Rolex and patented. This silicon hairspring has a patented geometry that assures the calibre’s regularity in any position. Tissot traces its extensive heritage back again to 1853, when it absolutely was Launched by The daddy-son workforce of Charles-Félicien https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/